Dynamic Web Development with Seaside

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14.1A Seaside Program Checker

Slime analyzes your Seaside code and reveals potential problems. Slime is an extension of Code Critics that is shipped with the Refactoring Browser. Code Critics, also called SmallLint, is available with the Refactoring Browser originally developed by John Brant and Don Roberts. Lukas Renggli and the Seaside community extended Code Critics to check common errors or bad style in Seaside code. The refactoring tools and Slime are available in the One-Click Image and we encourage you to use them to improve your code quality.

Pay attention that the rules are not bulletproof and by no means complete. It could well be that you encounter false positives or places where it misses some serious problems, but it should give you an idea where your code might need some further investigation.

Here are some of the problems that Slime detects:

Possible Bugs. This group of rules detects severe problems that are most certainly serious bugs in the source code:

  • The message with: is not last in the cascade,
  • Instantiates new component while generating HTML,
  • Manually invokes renderContentOn:,
  • Uses the wrong output stream,
  • Misses call to super implementation,
  • Calls functionality not available while generating output, and
  • Calls functionality not available within a framework callback.

Bad style. These rules detect some less severe problems that might pose maintainability problems in the future but that do not cause immediate bugs.

  • Extract callback code to separate method,
  • Use of deprecated API, and
  • Non-standard object initialization.

Suboptimal Code. This set of rules suggests optimization that can be applied to code without changing its behavior.

  • Unnecessary block passed to brush.

Non-Portable Code. While this set of rules is less important for application code, it is central to the Seaside code base itself. The framework runs without modification on many different Smalltalk platforms, which differ in the syntax and the libraries they support. To avoid that contributors from a specific platform accidentally submit code that only works with their platform we’ve added some rules that check for compatibility. The rules in this category include:

  • Invalid object initialization,
  • Uses curly brace arrays,
  • Uses literal byte arrays,
  • Uses method annotations,
  • Uses non-portable class,
  • Uses non-portable message,
  • ANSI booleans,
  • ANSI collections,
  • ANSI conditionals,
  • ANSI convertor,
  • ANSI exceptions, and
  • ANSI streams.

Copyright © 20 November 2017 Stéphane Ducasse, Lukas Renggli, C. David Shaffer, Rick Zaccone
This book is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.

This book is published using Seaside, Magritte and the Pier book publishing engine.